I had 1 interview with HR and 1 interview with the hiring manager. A week later, HR emailed me to say they had an update and to call them and received a generic explanation for why they were going in a different direction

Phone interview followed by multiple on-site interviews. Each interview contained a case study problem to work through and follow up discussion related thereto. Each interviewer was incredibly nice and easy to talk to. They asked a lot of hypothetical questions but were generally more concerned with company and culture fit after the initial questions were completed. Great people, great company, highly enjoyable interview process. Position was ultimately pulled as a result of reallocation of resources according to HR.